Polarizability

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Hello Admins

I would like to know the procedure to compute the molecular polarizability "alpha" using the properties module of NWChem. My system has a total of 34 atoms (2 metals and ligands) and is a quadrivalent anion. The response keyword computes the electric polarizabilty and other parameters like tensors, etc. After reading through the properties section I learnt that the input should be like as below:

....
geometry
....
end
dft
....
end
properties
response 1 ... # order and frequency in hartree
velocity
end
task dft response

However I have not understood the frequency part. How should we select the value(s) to put in the input? should we do a frequency calculation before and find out the specific value? but even if so please explain in detail this concept.

Thanks and regards,
Mic


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